Figure 4. Netrin-1 inhibited the expression of pro-inflammatory cytokines and chemokines in lung tissues in LPS-challenged ALI mice. (A) mRNA of IL-8; (B) mRNA of IL-1β; (C) mRNA of CXCL2; (D) Protein of IL-8; (E) Protein of IL-1β; (F) Protein of CXCL2 (††P < 0.01 vs. vehicle group; **P < 0.01 vs. LPS group).